My Sylver used to be a shoulder cat, then, he grew up (well over 13#) and it hurt too bad to have him on my shoulders. He still tries every now and then to get up there, so I just lean forward, he gets on my back. I walk to the cat tree, he jumps on that, and thats it. I didn't think of he would ever get that big, because he was SO tiny as a kitten, he was still tiny even as a teenager. His nickname was Itty Bitty. Then, suddenlly, he is the biggest (Not fat) cat in the house. Now, he is Itty Bitty Big Kitty.